Planar lightwave circuits for quantum cryptographic systems
Yoshihiro Nambu, Takaaki Hatanaka, and Kazuo Nakamura
TL;DR
This paper demonstrates that planar lightwave circuits can be used to create robust, polarization-insensitive quantum cryptographic systems with high interference visibility, suitable for secure communication.
Contribution
It introduces a PLC-based quantum cryptographic system and shows its effectiveness with high-visibility interference despite polarization fluctuations.
Findings
High-visibility (>0.98) interference in PLC-based MZIs
Polarization insensitivity of the system
Feasibility for secure quantum communication
Abstract
We propose a quantum cryptographic system based on a planar lightwave circuit (PLC) and report on optical interference experiments using PLC-based unbalanced Mach-Zehnder interferometers (MZIs). The interferometers exhibited high-visibility (>0.98) interference even when the polarisation in the optical fibre connecting the two MZIs was randomly modulated. The results demonstrate that a PLC-based setup is suitable for achieving a polarisation-insensitive phase-coding cryptographic system.
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Taxonomy
TopicsOptical Network Technologies · Quantum Information and Cryptography · Advanced Photonic Communication Systems